feat(bls): final version

Author: ldecarvalho-doc

menu/navigation.json

@@ -300,6 +300,10 @@
                   {
                     "label": "Instances footprint calculation",
                     "slug": "instances-env-footprint"
+                  },
+                  {
+                    "label": "Block Storage footprint calculation",
+                    "slug": "block-storage-env-footprint"
                   }
                 ],
                 "label": "Additional Content",

pages/environmental-footprint/additional-content/bare-metal-env-footprint.mdx

@@ -52,5 +52,5 @@ Therefore 1,62 kgCO2e is added to the total manufacturing impact of this server.
 To calculate the usage, we consider the French energy mix and the datacenter's PUE. In this example, they are O,056kgCo2e/kwh and 1,16, respectively. Which results in:
 
 ```math
-UsageFootprint = 0,110 x 100 x 0,056 x 1,16 = 0,715 kgCo2e
+UsageFootprint = 0,110 * 100 * 0,056 * 1,16 = 0,715 kgCo2e
 ```

pages/environmental-footprint/additional-content/block-storage-env-footprint.mdx

@@ -7,8 +7,8 @@ content:
   paragraph: This page explains how Scaleway calculates the environmental footprint of its Block Storage in detail.
 tags: block-storage environmental-footprint impact datacentre
 dates:
-  validation: 2025-07-01
-  posted: 2025-07-01
+  validation: 2025-07-10
+  posted: 2025-07-10
 categories:
   - environmental-footprint
   - block-storage
@@ -26,42 +26,52 @@ The total estimated impact of Block Storage volumes is calculated by integrating
 
 ### Ratio per storage volume
 
-To allocate the impact of a Block Storage volume, we apply the unit resulting from the RCP allocation rule to all calculation steps, the `bls_ration`:
+To allocate the impact of a Block Storage volume, we apply the unit resulting from the RCP allocation rule to all calculation steps, the `bls_ratio`:
 
 ```
-VOLsto/VolstoPool = bls_ratio
+bls_ratio = VOLsto/VolstoPool
 ```
 
 - **VOLsto** - represents the **reserved volume** per user. In Block Storage, your data is replicated three times on multiple nodes to guarantee availability, so the **VOLsto** is applied with factor of 3 to account for replication.
 - **VolstoPool** - represents all the storage for Block Storage volumes on the server that hosts them (around 60%).
 
+In the example below we consider a **Volsto** of 600 and a **VolstoPool** of 1000.
+
+```
+bls_ratio = 600/1000 = 0,6
+```
+
 ### Manufacturing impact
 
-The manufacturing impact of Block Storage volumes is attributed based on the servers that host the storage.
+The calculation of the manufacturing impact of Block Storage volumes is based on:
+
+- The fabrication impact of servers that host user storage
+- The fabrication impact of servers used by the Scaleway Block Storage team to manage the service - on both the Control and Data planes
+
+The calculation is the same used for [measuring the impact of manufacturing for Bare Metal servers](/environmental-footprint/additional-content/environmental-footprint-calculator/#customer-servers), but for Block Storage we also apply the `bls_ratio` to break the impact down to only the allocated volumes.
+
+#### Calculation example
 
-Considering a server with a lifespan of 6 years (52 560 hours) and power of 110w, for 100 hours and considering via Boavizta estimates that the impact of the manufacturing of this server is 850 kgCo2e, and a `bls_ratio` of  we can make the following calculation:
+For the example below, we consider a single server with a lifespan of 6 years (52 560 hours) and power of 110w. We measure the impact of 100 hours and consider through [Boavizta estimates](https://www.boavizta.org/) that the impact of the manufacturing of this server is 850 kgCo2e. Also considering a `bls_ratio` of 0,6, we make the following calculation:
 
 ```
-VolumeManufacturingImpact = (100 / 52560) * 850 * bls_ratio = [À REMPLIR] kgCO2e
+VolumeManufacturingImpact = (100 / 52560) * 850 * 0,6 = 0,97 kgCO2e
 ```
 
 ### Usage impact
 
-The calculation of the impact of cross-IT equipments takes into consideration the manufacturing and usage impacts of both the control and data plane of the internal Scaleway infrastructure for Block Storage.
+The calculation of the usage impact of Block Storage volumes is based on:
 
-- **Control Plane** - Calculate impact as done for Apple Silicon product VMs - hardware and vms
-- **Data Plane** - Calculate manufacturing impact via [Boavizta](https://www.boavizta.org/), retrieve electricity consumption estimation and multiply by PUE and energy mix
+- The usage of servers that host user storage
+- The usage of infrastructure and service management servers by the Scaleway Block Storage team to run the Block Storage service. In this case we consider both the Control and Data planes.
+- The impact of the electrical power dedicated to Block Storage across the infrastructure
 
-*   The allocation is done **based on electrical power**: we need to retrieve the electrical power dedicated to Block Storage:
-    *   Retrieval of the estimation of the electricity consumption of the Block Storage servers –> [Handbook](https://handbook.scaleway.com/) (static data, like for Elastic Metal).
-    *   Retrieval of the **quantities of hardware of the Data plane**.
-    *   We add the **electricity consumption of the Control Plane VMs**.
+To calculate the usage, we consider the French energy mix and the datacenter's PUE.
 
-To calculate the usage, we consider the French energy mix and the datacenter's PUE. In this example, they are O,056kgCo2e/kwh and 1,16, respectively. Which results in:
+In the example below, they are O,065kgCo2e/kwh and 1,16, respectively. Considering an electrical consumption of 600wh, 100 hours of usage, and a `bls_ratio` of 0,6, the total usage impact comes down to:
 
 ```math
-UsageFootprint = 0,110 x 100 x 0,056 x 1,16 = 0,715 kgCo2e
+UsageImpact = (0,600 x 0,065) * 100 * 0,6 = 2,34 kgCo2e
 ```
 
-### Energy usage impact
 

pages/environmental-footprint/additional-content/environmental-footprint-calculator.mdx

@@ -134,6 +134,7 @@ You can find the calculation specifications for each of the available products i
 
 - [Bare Metal](/environmental-footprint/additional-content/bare-metal-env-footprint)
 - [Instances](/environmental-footprint/additional-content/instances-env-footprint)
+- [Block Storage](/environmental-footprint/additional-content/block-storage-env-footprint)
 
 ### Cross-IT equipment & stock
 

pages/environmental-footprint/additional-content/instances-env-footprint.mdx

@@ -95,7 +95,7 @@ The allocation of the hypervisor resources for this particular Instance is calcu
 We multiply the resource allocation by the Instance's lifespan ratio and the hypervisor's manufacturing impact to obtain the manufacturing impact allocated to the Instance:
 
 ```
-(100 hours / 52,680 hours) × 100 kgCO2e × 0.425 = 0.080 kgCO2eq
+(100 hours / 52,680 hours) * 100 kgCO2e * 0.425 = 0.080 kgCO2eq
 ```